<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps
      :active="2"
      process-status="wait"
      align-center
      style="margin-bottom: 40px;"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>

    <el-button type="text" @click="openDialog()">添加章节</el-button>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费" >
          <el-radio-group v-model="video.isFree">
            <el-radio :label="1">免费</el-radio>
            <el-radio :label="0">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- TODO -->
            <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/video/uploadAliyVideo'"
              :limit="1"
              class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                  支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                  GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                  MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                  SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
              </el-tooltip>
            </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 章节 -->
    <ul class="chanpterList">
      <li
        v-for="chapter in chapterNestedList"
        :key="chapter.id">
        <p>
          {{ chapter.title }}

          <span class="acts">
                <el-button type="text" @click="openVideo(chapter.id)">添加课时</el-button>
                <el-button style="" type="text" @click="editChapter(chapter.id)" >编辑</el-button>
                <el-button type="text" @click="deleteChapter(chapter.id)">删除</el-button>
            </span>
        </p>

        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li
            v-for="video in chapter.children"
            :key="video.id">
            <p>{{ video.title }}
              <span class="acts">
                        <el-button type="text" @click="editVideo(video.id)">编辑</el-button>
                        <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
                    </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>
  </div>
</template>

<script>
import chapter from "@/api/edu/chapter";
import video from "@/api/edu/video";

export default {
  data() {
    return {
      saveBtnDisabled: false,
      saveVideoBtnDisabled: false,
      courseId: "", // 课程id
      chapterNestedList: [],
      chapter: {
        title: '',
        sort: ''
      },
      video: {// 课时对象
        title: '',
        sort: 0,
        isFree: 0,
        videoSourceId: '',
        videoOriginalName:'' // 视频名称
      },
      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,
      fileList: [], // 上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    };
  },
  created() {
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      this.getAllChapterVideo();
    }
  },
  methods: {
    // 点击x调用
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${ file.name }？`);
    },
    // 点击确定调用
    handleVodRemove() {
      // 调用删除视频接口
      video.deleteAlyVideoById(this.video.videoSourceId)
        .then(response => {
          // 提示
          this.$message({
            message: "移除成功",
            type: "success"
          });
          this.video.videoSourceId = ''
          this.video.videoOriginalName = ''
          this.fileList = []
        })
    },
    //上传视频成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    // 根据小节id查询小节信息
    editVideo(videoId) {
      video.getVideoById(videoId)
        .then(response => {
          this.dialogVideoFormVisible = true
          this.video = response.data.eduVideo
        })
    },
    // 修改小节信息
    updateVideo() {
      video.updateVideo(this.video)
        .then(response => {
          // 提示
          this.$message({
            message: "编辑课时成功",
            type: "success"
          });

          // 关闭弹框
          this.dialogVideoFormVisible = false

          // 刷新页面
          this.getAllChapterVideo();
        })
    },
    // 添加小节
    saveVideo() {
      this.video.courseId = this.courseId
      video.addVideo(this.video)
        .then(response => {
          // 提示
          this.$message({
            message: "添加课时成功",
            type: "success"
          });

          // 关闭弹框
          this.dialogVideoFormVisible = false

          // 刷新页面
          this.getAllChapterVideo();
        })
    },
    saveOrUpdateVideo() {
      if (!this.video.id) {
        this.saveVideo()
      } else {
        this.updateVideo()
      }
    },
    // 打开添加小节弹窗
    openVideo(chapterId) {
      // 弹框
      this.dialogVideoFormVisible = true
      // 设置章节id
      this.video.chapterId = chapterId
      // 清空小节其他数据
      this.video.title = ''
      this.video.sort = 0
      this.video.free = 0
      this.video.videoSourceId = ''
      this.fileList = []
    },
    // 删除小节
    deleteVideo(videoId) {
      this.$confirm("此操作将永久删除该课时记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      }).then(() => {
        // 调用删除方法
        video.deleteVideo(videoId)
          .then(response => {
            // 提示信息
            this.$message({
              type: "success",
              message: "删除成功!"
            });
            // 回到列表页面
            this.getAllChapterVideo();
          })
      });
    },
    // 删除章节
    deleteChapter(chapterId) {
          this.$confirm("此操作将永久删除该章节记录, 是否继续?", "提示", {
            confirmButtonText: "确定",
            cancelButtonText: "取消",
            type: "warning"
          }).then(() => {
            // 调用删除方法
            chapter.deleteChapter(chapterId)
              .then(response => {
                // 提示信息
                this.$message({
                  type: "success",
                  message: "删除成功!"
                });
                // 回到列表页面
                this.getAllChapterVideo();
              })
          });
    },
    // 编辑弹框回显
    editChapter(chapterId) {
      chapter.getChapterById(chapterId)
        .then(response => {
          this.chapter = response.data.eduChapter
          this.dialogChapterFormVisible = true
        })
    },
    // 添加章节弹框
    openDialog() {
      this.dialogChapterFormVisible = true
      this.chapter.title = ''
      this.chapter.sort = ''
    },
    // 添加章节
    saveChapter() {
      this.chapter.courseId = this.courseId
      chapter.addChapter(this.chapter)
        .then(response => {


          // 提示
          this.$message({
            message: "添加章节成功",
            type: "success"
          });

          // 关闭弹框
          this.dialogChapterFormVisible = false

          // 刷新页面
          this.getAllChapterVideo();

        })
    },
    // 修改章节
    updateChapter() {
      chapter.updateChapter(this.chapter)
        .then(response => {
          // 提示
          this.$message({
            message: "编辑章节成功",
            type: "success"
          });

          // 关闭弹框
          this.dialogChapterFormVisible = false

          // 刷新页面
          this.getAllChapterVideo();
        })
    },
    // 添加或编辑章节
    saveOrUpdate() {

      if (!this.chapter.courseId) {
        this.saveChapter()
      } else {
        this.updateChapter()
      }


    },
    // 根据课程id查询章节和小节
    getAllChapterVideo() {
      chapter.getAllChapterVideo(this.courseId)
        .then(response => {
          this.chapterNestedList = response.data.allChapterVideo
        })
    },
    previous() {
      // 跳转到第一步
      this.$router.push({ path: "/course/info/" + this.courseId });
    },

    next() {
      // 跳转到第三步
      this.$router.push({ path: "/course/publish/" + this.courseId });
    }
  }
};
</script>

<style scoped>
.chanpterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chanpterList li {
  position: relative;
}
.chanpterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chanpterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>
